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VU c p/m WlLLlAM B'RADSHAW LEACl-.lll/IAN,`OF LEEDS, ENGLAND.A

Letters Patent No. 85,106, (lated December 22, 1868.

MPROVED ROTARY STEAM-ENGINE.

The Schedule referred to in these Letters Patent and making part of thesameA To all to whom it may concern.v

Be it known that 1', vWlLLIAM BnAnsHAw LnAen- MAN, of Leeds, in thecounty of York,'England, eligineen, a subject ofthe Queen of GreatBritain, have invented or discovered an Improved ltotarylVater orSteam-Motive-Power Engine and I, the said W1 L- LnrM BRAnsHAw LnAcnn'AX,doliereby declare the nature of the said invention, and iu whatinannerthe same is to'be performed, to he lmrticularly described andascertained in and by the' following statement thereof; that is to say-Through the sides or ends of a cylinder' of suitahldimensions I pass ashaft.

Upon this shaftaml.within the said c '1inder, I mountanother smallercylinder, provided with three recesses, and placed cccentrically withregard to the outer c v inder, the inner and outer cylinders touching inone portion of their respective circnmfereirees, leaving, on theopposite side, a space.

I also cast to the inner surtiuze of one end of the outer cylinder a'double ring or internal eccentric, which is concentric with the outercylinder or casing itself, but not with the shaft which passes throughit.

lVithin this double ring, three slide-blocks are free to move, and withthein are connected three bars, (b v means of fast studs,`) which extendacross the diameter ofthe cylinder, and pass respectivelytlnougllslot-holes in the surface of the inner cylinder.

To each of these bars is attached'a feather or iloat, lextending thewholewidth of the cylinder.

l may here add that the pins` by which the. bars i re connected to theslide-blocks admit of the floats, along with the bars to which they areattached, receding from the centre ofthe shaft as they are urged by theeccentric.

The cylinder is provided with ports, placedopposite to each other, forthe admission and emission of steam or water, whichever may' be used.

Admitting steam, for instance, at the upper side, it passes between thetwo cylinders, until it reaches one of the floats, betbre spoken of,which, presenting a sul'- face of resistance, is driven round, and, asit approaches the upper portion ofthe outer cylinder, grznluall)`withdraws towards the centre, -by means of the eccentric arrangementbefore named. The i'loat11r vreachcs the ejection-port, at which thesteam passes out of thel c 'vlinder, the preceding` teather or iloatmeantime reaching the admission-port, for a fresh charge, and, as thefirst float cornes round to its iirst position, it is gradually drawncloser and closer toward 4the centre, until it reaches that part wherethetwo cylinders touch each other. Passing that point, as it approachesthe steamport, the eccentric-ring on the 'outer cylinder gradually urgesit out,- and the operation is repeated.

In some instances, however, 1 prefer to admit the steam where the innerand outer cylinders come in contact, admitting such steam through aslide-valve, circular in its formation, and provided with three ports,:is willbe explained iu the description ofdiawings.

l also use gearing to rotate the shalt upon which the valve is keyed. l

l use an vordinary throttle-valve and governor-apparatus, which may alsohe worked in the manner usual in ordinary engines.

In order, however, that .my invention may he the hetter understood,reference is made to the accompanying sheet of drawings, and to thexletters and iigures marked thereon j. that to say:

Description 0 7" Dirac/ings.

Figure 1 shows a sid(A eleva-tion ofthe engine, with l the adj uncts ofthrottle-valveand governor, before re- .iifrred to, and

through the junction-pipe C, into the pipe d of the cylinder D, it willcome in contact, after passing up the recess between the outer cylinder,D, andthe inner cylinder, E, with the iioat f, Jo. 1, and give theresult.-

previouslynained, the respective i'loats being urged inwards andoutwards,^in their circular rotation,- by the Aaction of .theeccentrics, Gr and H, upon the respective hars, Iz., to which they areconnected.

In the-drawing, iiled herewith, it will be seen that three iioats f areprovided, and consequently three ports a, to the valve, so that, as eachfloat approaches the port d, one of the ports is there ready to supplythe steam, where steam is used, requisite to urgeit round. As each floatapproaches the opening I, the steam is, of course, emitted, noresistance being oered to it.

The governor J and throttle-valve arrangement K, with the intermediateconnection, being well understood, and their junction, through the pipeIt, with the engine, it is unnecessary to describe further than toremark that such governor-arrangements are driven from the small pulley,l, on the shaft L, communicating, by means of abelt, with the pulley M.

Fig shows the float, with a spring andwedge-4 pieces, in dotted line,

Figure 4 showing an end view of the float so recessed. It may here beobserved that lining or packing-rings, adjusted by set-screws, aresometimes used, as shown in dotted lines in tiff. 2, to save the wear ofthe ends of the casing.

Having now fully shown and described the nature of my invention, I wishit to be understood that what 1l. claim as novel, and of my invention,

1. The' combination and arrangement, with the outer Cylinder, amd itsconeentn'e double ring, and the inner eccentric-cylinder and shaft,ofthe slide blocks, which` move in the recess formed by said doublering, the bars, pivoted to said blocks, and the venes or floats, carriedby said bar, in the manner described, whereby the valles or oats areconstantly retained in the desired position, not being allowed freeaction.

2. The arrangement, with therotary engine, when

